NVD

CVE-2025-21597 Detail

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer to cause Denial of Service (DoS). On all Junos OS and Junos OS Evolved platforms, when BGP rib-sharding and update-threading are configured, and a BGP peer flap is done with specific timing, rpd crashes and restarts. Continuous peer flapping at specific time intervals will result in a sustained Denial of Service (DoS) condition. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session. The issue can occur with or without logical-systems enabled. This issue affects: Junos OS: * All versions before 20.4R3-S8, * 21.2 versions before 21.2R3-S6, * 21.3 versions before 21.3R3-S5, * 21.4 versions before 21.4R3-S4, * 22.1 versions before 22.1R3-S3, * 22.2 versions before 22.2R3-S1, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. Junos OS Evolved: * All versions before 21.2R3-S6-EVO, * 21.3-EVO versions before 21.3R3-S5-EVO, * 21.4-EVO versions before 21.4R3-S4-EVO, * 22.1-EVO versions before 22.1R3-S3-EVO, * 22.2-EVO versions before :22.2R3-S1-EVO, * 22.3-EVO versions before 22.3R3-EVO, * 22.4-EVO versions before 22.4R3-EVO.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Juniper Networks, Inc.

CVSS-B 6.0 MEDIUM

Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A

CVSS 3.x Severity and Vector Strings:

CNA: Juniper Networks, Inc.

Base Score: 5.3 MEDIUM

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://kb.juniper.net/JSA96451	Juniper Networks, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-754	Improper Check for Unusual or Exceptional Conditions	Juniper Networks, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

CVE Modified by Juniper Networks, Inc. 6/17/2026 4:43:49 AM

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Type

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Affected

[{"vendor":"Juniper Networks","product":"Junos OS","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"20.4R3-S8","versionType":"semver","status":"affected"},{"version":"21.2","lessThan":"21.2R3-S6","versionType":"semver","status":"affected"},{"version":"21.3","lessThan":"21.3R3-S5","versionType":"semver","status":"affected"},{"version":"21.4","lessThan":"21.4R3-S4","versionType":"semver","status":"affected"},{"version":"22.1","lessThan":"22.1R3-S3","versionType":"semver","status":"affected"},{"version":"22.2","lessThan":"22.2R3-S1","versionType":"semver","status":"affected"},{"version":"22.3","lessThan":"22.3R3","versionType":"semver","status":"affected"},{"version":"22.4","lessThan":"22.4R3","versionType":"semver","status":"affected"}]},{"vendor":"Juniper Networks","product":"Junos OS Evolved","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"21.2R3-S6-EVO","versionType":"semver","status":"affected"},{"version":"21.3-EVO","lessThan":"21.3R3-S5-EVO","versionType":"semver","status":"affected"},{"version":"21.4-EVO","lessThan":"21.4R3-S4-EVO","versionType":"semver","status":"affected"},{"version":"22.1-EVO","lessThan":"22.1R3-S3-EVO","versionType":"semver","status":"affected"},{"version":"22.2-EVO","lessThan":"22.2R3-S1-EVO","versionType":"semver","status":"affected"},{"version":"22.3-EVO","lessThan":"22.3R3-EVO","versionType":"semver","status":"affected"},{"version":"22.4-EVO","lessThan":"22.4R3-EVO","versionType":"semver","status":"affected"}]}]

Initial Analysis by NIST 1/26/2026 2:35:17 PM

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CPE Configuration

Record truncated, showing 2048 of 9306 characters.
View Entire Change Record

OR
          *cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.3:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.3:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.3:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.3:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:* versions up to (excluding) 21.2
          *cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.3:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.3:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:j

Added

Reference Type

Juniper Networks, Inc.: https://kb.juniper.net/JSA96451 Types: Vendor Advisory

New CVE Received from Juniper Networks, Inc. 4/09/2025 4:15:26 PM

Action	Type	New Value
Added	Description	An Improper Check for Unusual or Exceptional Conditions vulnerability in routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer to cause Denial of Service (DoS). On all Junos OS and Junos OS Evolved platforms, when BGP rib-sharding and update-threading are configured, and a BGP peer flap is done with specific timing, rpd crashes and restarts. Continuous peer flapping at specific time intervals will result in a sustained Denial of Service (DoS) condition. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session. The issue can occur with or without logical-systems enabled. This issue affects: Junos OS: * All versions before 20.4R3-S8, * 21.2 versions before 21.2R3-S6, * 21.3 versions before 21.3R3-S5, * 21.4 versions before 21.4R3-S4, * 22.1 versions before 22.1R3-S3, * 22.2 versions before 22.2R3-S1, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. Junos OS Evolved: * All versions before 21.2R3-S6-EVO, * 21.3-EVO versions before 21.3R3-S5-EVO, * 21.4-EVO versions before 21.4R3-S4-EVO, * 22.1-EVO versions before 22.1R3-S3-EVO, * 22.2-EVO versions before :22.2R3-S1-EVO, * 22.3-EVO versions before 22.3R3-EVO, * 22.4-EVO versions before 22.4R3-EVO.
Added	CVSS V4.0	AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:X/U:X
Added	CVSS V3.1	AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-754
Added	Reference	https://kb.juniper.net/JSA96451

Quick Info

CVE Dictionary Entry:
CVE-2025-21597
NVD Published Date:
04/09/2025
NVD Last Modified:
06/17/2026
Source:
Juniper Networks, Inc.

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2025-21597 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by CISA-ADP 6/17/2026 4:43:49 AM

CVE Modified by Juniper Networks, Inc. 6/17/2026 4:43:49 AM

Initial Analysis by NIST 1/26/2026 2:35:17 PM

New CVE Received from Juniper Networks, Inc. 4/09/2025 4:15:26 PM

Quick Info